| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Arcochiton richardsoni
Taxonomy
Arcochiton richardsoni was named by Hoare et al. (2002). Its type specimen is UCMP 154091, a valve (tail plate), and it is not a trace fossil. Its type locality is UCMP D-5252, Lookout Hill, Southern Arrow Canyon Range, which is in an Artinskian shallow subtidal limestone in the Bird Spring Formation of Nevada.
Synonymy list
| Year | Name and author |
|---|---|
| 2002 | Arcochiton richardsoni Hoare et al. p. 263 fig. 5 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Arcochiton richardsoni Hoare et al. 2002
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. D. Hoare et al. 2002 | Tail plate with narrow jugal area set off from lateropleural areas by deep, narrow sulci; lateropleural areas convex, set off from lateral margins by sulci; sutural laminae large; intermediate plates with distinct lateral areas; head plate subtriangular, steeply arched.
Description.—Head plate thick, subtriangular, strongly arched with steep slope to anterior and lateral margins; anterior margin more sharply convex than lateral margins, posterior margins nearly straight, not mucronate; ventral surface with prominent large apical area medially, extending as a narrowing ridge along posterior margins; ventrally thickened by a low, rounded ridge curving to anterolateral corners; dorsal surface with distinct, closely space pustules and faint comarginal growth ridges. Intermediate plates wider than long, strongly arched; anterior margin with shallow jugal sinus, lateral margins convex, posterior margins straight, slightly mucronate; jugal area broad anteriorly, set off from lateral and pleural areas; lateral areas distinct, narrow, raised above pleural areas; sutural laminae wide, length unknown; ventral surface with large apical area extending as narrow ridge to posterolateral corners; ventral surface thickened by low, rounded, transverse ridge anterior to midlength; dorsal surface with distinct, closely spaced pustules and comarginal growth ridges on lateral areas. Tail plate strongly arched transversely and longitudinally; anterior margin with narrow, deep jugal sinus and concave in areas of sutural laminae, lateral margins flatly convex converging on narrowly rounded posterior margin; mucro terminal; jugal area narrow, set off from lateropleural areas by deep, narrow sulci; lateropleural areas convex and separated from raised lateral margins by sulci; sutural laminae wide, extending from margin of jugal area to near anterolateral corners, length unknown, ventral surface with large hypotyche extending as broadly triangular areas to anterolateral corners; dorsal surface with distinct, closely spaced pustules. Faint traces of color marking are preserved on tail and intermediate plates (Fig. 5.7, 5.12, 5.15 ). The markings are too incomplete to compare with those described by Hoare and Smith (1984) from the Permian of Texas. |